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I don't know if the following is by design but it can give unexpected results if you don't know it.
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I created a switch that checks if a variable is empty or not:
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{var/empty:my_var}

Something was wrong with the switch so in the Values Setup I put:

A:{success:my_var is empty}

When I test the code and my_var is empty the success message is displayed.
I suppose that A is evaluated as true. The code in switch_output.php is indeed:

$test_result = (($data == $target_value) OR ($target_value === '*'));

Using === instead of a loose equality would be a problem for the switch function?
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maxx